/Engine/Source/Runtime/Cbor/Public/CborWriter.h
CBOR standard endianness is big endian. For interoperability with external tools, the standard endianness should be used. For internal usage, the platform endianness is faster.
FCborWriter ( [FArchive](API\Runtime\Core\Serialization\FArchive) * InStream, ECborEndianness InWriterEndianness )